1 files changed, 4 insertions, 3 deletions

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 7a299d43987a..2753f9261115 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -341,10 +341,10 @@ int num_to_str(char *buf, int size, unsigned long long num)
 }
 
 #define SIGN    1               /* unsigned/signed, must be 1 */
-#define ZEROPAD 2               /* pad with zero */
+#define LEFT    2               /* left justified */
 #define PLUS    4               /* show plus */
 #define SPACE   8               /* space if plus */
-#define LEFT    16              /* left justified */
+#define ZEROPAD 16              /* pad with zero, must be 16 == '0' - ' ' */
 #define SMALL   32              /* use lowercase in hex (must be 32 == 0x20) */
 #define SPECIAL 64              /* prefix hex with "0x", octal with "0" */
 
@@ -467,7 +467,8 @@ char *number(char *buf, char *end, unsigned long long num,
         }
         /* zero or space padding */
         if (!(spec.flags & LEFT)) {
-                char c = (spec.flags & ZEROPAD) ? '0' : ' ';
+                char c = ' ' + (spec.flags & ZEROPAD);
+                BUILD_BUG_ON(' ' + ZEROPAD != '0');
                 while (--spec.field_width >= 0) {
                         if (buf < end)
                                 *buf = c;